Custom Script TroubleShooting

Need help in executing custom python script.

I am updating a request and changing the site based on support group.

I don't see anything being run. Can't find error.

How can I verify that python custom script ran? Find if it errored out

# This python script is used to change the Site value on a request o

import sys

import json

import datetime

# File containing request details will be stored as json object and the file path will be passed as argument to the script replacing the $COMPLETE_JSON_FILE argument

file_Path = sys.argv[1]

# Load the json content which contains request details

with open(file_Path) as data_file:

data = json.load(data_file)

requestObj = data['request']

# get the value for 'GROUP'

# set the additional field value to request due by time

setSite = requestObj["GROUP"]

# The return output should be in the below format

#{'operation': [{'OPERATIONNAME': 'EDIT_REQUEST', 'INPUT_DATA': [{'DUEBYTIME': '28 Jul 2016, 13:56:00'}]}], 'result': 'success', 'message': 'Sample Python script for updating request site'}

# Create json object which needs to be returned

detailsJSON1={}

detailsJSON1["SITE"]= setSite

resultjson={}

resultjson["result"] ="success"

# sample message to be returned

resultjson["message"] = "Python script executed for updating request due by time"

resultjson["operation"] = []

operationJson={"INPUT_DATA":[]}

operationJson["OPERATIONNAME"]="EDIT_REQUEST"

operationJson["INPUT_DATA"].append(detailsJSON1)

resultjson["operation"].append(operationJson)